:host {
    display: block;
    .treeview-item {
        white-space: nowrap;
        padding: 4px 0px;
        margin: 0px;
        list-style: none;
        outline: 0px;
        .treeview-item {
            margin: 0px;
            padding: 0px 0px 0px 18px;
        }
    }
}